They might be hidden, Vista would hide savegame files depending on certain things, sometimes it would be because of codes inside the save files. As a leftover feature windows 7 sometimes still do it because of the code. If you still can't find it inside install directory or in the game folder for it, or whatever rob says, but you can find the folder with savegame or something of the like, by unhidding it. Unluckly, my windows 7 has been modified to where I would not be able to tell you how to do it.